Influence of Cooling Rate and Sn Addition on Microstructure Formation of As-cast GCD700 Spheroidal Graphite Cast Irons

하성호; 최재구; 김동혁; 신상윤

doi:10.7736/JKSPE.023.118

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저널정보

Korean Society for Precision Engineering
Journal of the Korean Society for Precision Engineering 학술저널
Journal of the Korean Society for Precision Engineering Vol.41 No.3
2024.3 175 - 182 (8page)
DOI : 10.7736/JKSPE.023.118

저자정보

하성호 (한국생산기술연구원)
최재구 (한국생산기술연구원)
김동혁 (한국생산기술연구원)
신상윤 (SBB테크)

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초록·키워드

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This study investigated the influence of cooling rate and Sn addition on the microstructure formation of as-cast GCD700 spheroidal graphite cast irons. Changes in cooling rate manifested as step cast thickness differences. Optical microstructures of as-cast GCD700 alloys revealed α-ferrite and pearlite and dispersed graphite nodules. In all examined thicknesses without Sn, the α-ferrite, rather than the pearlite, surrounding graphite nodules appeared to dominate microstructures, and the graphite looked well rounded, whereas microstructure containing 0.09% Sn had a significantly expanded pearlite area. Image analysis showed numbers of graphite nodules increased only on decreasing cast thickness. However, the phase fractions of ferrite and pearlite were not dependent on thickness. For samples containing Sn, pearlite fractions significantly increased with Sn content. Thermodynamic calculations and scanning electron microscopy-based microstructural analysis confirmed that the Sn contents examined had no significant effect on phase formation, Sn segregation, or the relationships between ferrite and Fe3C orientations in pearlite.

#Spheroidal graphite cast iron (구상흑연주철) #Microstructure (미세조직) #Solidification (응고) #Pearlite (펄라이트) #Cooling rate (냉각속도) #Electron backscatter diffraction (후방산란전자회절패턴분석)